<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>input元素</title>
</head>
<body>
<form>
  <input type="text" name="firstname">
  <input type="date" name="date">
  <input type="datetime-local" name="datat">
  <input type="button" value="保存">
</form>
</body>
</html>